Meaning A girl's name of Greek origin, it means "truthful one." Origin of Alethea Greek +-100%Zoom level changed to 1 Popular Middle Names Jane, Serenity Pronunciation 🔊 Listen Alethea Similar Names Alathea Alethia Alithea Aissa Allysen Allsun Amina Amena Siddiqa Siddiqah Year by Year Popularity of Alethea